Improved Seismic Performance of RCC Building Irregular in Plan with Water Tank as Passive TMD

Abstract

The choices of building shapes and structural systems have significant effect on their seismic performance. Structures that have non-coincident centers of mass and stiffness are referred to as plan-irregular structures. Such structures could be highly vulnerable to earthquake damage due to torsional response. Regular buildings result in a fairly uniform distribution of seismic forces throughout its components, whereas irregular buildings result in highly indeterminate distribution of forces making the analysis prediction more complicated. This paper deals with analytical investigation of feasibility of implementing water tank as passive TMD on plan irregular building using SAP2000. The water tank was installed at the terrace level of L-shaped building. The response of building to earthquake data, namely, El-Centro 1940 and Bhuj 2001 were studied. The responses of the building with tank provided at three different locations of building were studied under five conditions, namely, tank empty, 0.25 h, 0.50 h, 0.75 h and full tank, where, h is the height of water level. It is concluded that water tank at top roof level in partially filled condition mitigate response of irregular buildings.